Rubber free weights are a type of weightlifting equipment that are made from a solid iron weight core, which is coated with layers of rubber to provide cushioning and protection. They are used for a variety of strength training exercises, and are commonly found in commercial and home gyms.Rubber dumbbells are a type of weightlifting equipment used for strength training exercises. These dumbbells feature a solid iron weight core, which is coated with a layer of rubber that provides cushioning and insulation.  The rubber coating on the weight core helps to protect the dumbbell from damage due to impact or scratching, and also helps to reduce noise when the dumbbell is dropped or set down on a hard surface. The rubber coating also provides a comfortable and non-slip grip, which can help prevent slippage and slipping during exercise.

Rubber dumbbells are available in a range of weights, from lightweight options for beginners or those recovering from an injury, to heavy-duty options for more experienced weightlifters who need a greater level of resistance. They are commonly found in gyms and fitness centers, as well as in home gyms due to their durability and versatility.

Rubber dumbbells and rubber weights dumbbells are essentially the same thing. Both of these terms refer to dumbbells that are coated in rubber to protect them from damage and reduce noise from impact.  Rubber dumbbells can also be adjustable or fixed-weight, and are available in a variety of weights to suit different fitness goals and abilities. Some rubber dumbbells also feature ergonomic handles for improved comfort and grip during exercises. 

Overall, rubber dumbbells are a popular choice for at-home or commercial gym use, as they are durable, provide a comfortable grip, and are less likely to damage floors or other equipment due to their rubber coating.

For Strength training, you can also consider FLUID X’s Aqua bags.  FLUID X’s aqua bags are made out of PVC.  Which makes it suitable for home use and will not cause much noise with dropped onto a hard surface.